Hi @Digirame
Appreciate your kind comments.
Yes there is a Canon EF to RF adapter which allows fully functionality on most ef (and also ef-s) lenses. I believe there may be a compatibility list for and features that may not be supported on older EF lenses.
Some 3rd party lenses may lose functionality but that would be more the change in mount than the adapter.
I've mentioned that I was surprised that my Tamron (EF mount) 100-400 lens worked as well as it did. I thought I might have to retire it.
I bought it used about 4 years ago and it was my primary wildlife lens on my Canon RP (yes it was a slow camera but still got some very nice pics with it) and even adapted it to my Fujifilm cameras.
I'm so glad I can keep using it but I might have to get a 600mm lens down the track.
Cheers
Paul